python - 将打印作业从 python 发送到谷歌云打印

Question

问题

我想将打印作业从 python 脚本发送到在“Google 云打印”中注册的打印机。

我认为我需要做些什么

• 谷歌账户

• google cloud api 注册:client-id，client-secret(获取我的访问 token )

• 访问 token

  我使用本教程获得了访问 token :

https://github.com/burnash/gspread/wiki/How-to-get-OAuth-access-token-in-console%3F

到目前为止我尝试了什么

由于 Bradley Ayers 正是为此目的编写了一个名为 cloudprinting ( https://github.com/bradleyayers/cloudprinting ) 的 python 库，因此以下脚本用于处理我的打印作业:

from cloudprinting import *

access_token = 'xyz_token_xyz' # here my personal access token is stated

auth = OAuth2(access_token, token_type="Bearer")

r = submit_job(printer="e506d12-dbe0-54d3-7392-fd69d45ff2fc", content="some_pdf_in_local_directory.pdf", auth=auth)

虽然脚本完成时没有错误消息，但它不起作用 - 这意味着最后没有打印作业。

所以我尝试想出一个http post to Google Cloud Print的尝试:

import requests
import json

access_token = 'xyz_acces_token_xyz' # here my personal access token is stated
printer =  "e506d12-dbe0-54d3-7392-fd69d45ff2fc" # random printer_id 
capabilities = [{}]

data = {"printerid": printer,
    "title": "name",
    "contentType": "pdf",
    "capabilities": json.dumps({"capabilities": capabilities})}

post_request = requests.post('https://www.google.com/cloudprint/submit', headers={'Authorization': access_token},data=data,files='some_pdf_in_local_directory.pdf')

print (post_request.text)

显然上面的 requests.post() 参数不正确。我需要以什么方式说明哪些参数？或者更具体地说:

1. 是''https://www.google.com/cloudprint/submit ' 正确的端点？
2. 正确的认证方式是什么？
3. 变量“数据”需要哪些参数值对？

任何想法都会受到赞赏。提前致谢!

Answer 1

如果有人仍然对使用本教程获取访问 token 感兴趣，我还可以使用 print(credentials.refresh_token) 获取刷新 token ，为此我编写了一个打印类，并在需要时刷新 token 。我可以在我的云打印机中从 python 成功打印，你还必须将范围更改为“https://www.googleapis.com/auth/cloudprint”

希望对你有帮助

class CloudPrint():
    def __init__(self,client_id=None, client_secret=None, access_token = None, refresh_token = None):
            self.client_id = client_id
            self.client_secret= client_secret
            self.access_token = access_token
            self.refresh_token = refresh_token
            self.deadline = time.time()-1
        self.api_url ='https://www.google.com/cloudprint/submit'

    def safe_check(self):
        if time.time()>float(self.deadline):
            self.refresh()

    def refresh(self):
        print('google refreshing')
        token = requests.post(
                'https://accounts.google.com/o/oauth2/token',
                data={
                    'client_id': self.client_id,
                    'client_secret': self.client_secret,
                    'grant_type': 'refresh_token',
                    'refresh_token': self.refresh_token,
                }
            )
        self.access_token = token.json()['access_token']
        self.deadline = self.deadline + token.json()['expires_in']
        print('new deadline ', self.deadline)

    def print(self, file, title, printerids):
            self.safe_check()
            body = {"printerid":printerids,
            "title":[title],
            "ticket":"{\r\n  \"version\": \"1.0\",\r\n  \"print\": {}\r\n}",
            }
            files = {'content': open(file,'rb')}

            headers = {"Authorization":"Bearer "+str(self.access_token)}
            print(headers)
            r = requests.post(self.api_url, data=body, files=files, headers=headers)
            print(r.url)
            print(r.text)

if __name__ == '__main__':
    gcp = CloudPrint(CLIENT_ID, CLIENT_SECRET, refresh_token=REFRESH_TOKEN)
    gcp.print('prueba.txt', 'prueba', PRINTER_ID_DEB)